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use hal::blocking::i2c;
use hal::blocking::spi;
use mutex;
#[cfg(feature = "std")]
use std::cell;
#[cfg(not(feature = "std"))]
use core::cell;
#[cfg(feature = "std")]
use std::marker;
#[cfg(not(feature = "std"))]
use core::marker;
pub struct BusManager<M: mutex::BusMutex<cell::RefCell<T>>, T>(M, marker::PhantomData<T>);
impl<M: mutex::BusMutex<cell::RefCell<T>>, T> BusManager<M, T> {
pub fn new(d: T) -> BusManager<M, T> {
let mutex = M::create(cell::RefCell::new(d));
BusManager(mutex, marker::PhantomData)
}
pub fn acquire<'a>(&'a self) -> BusProxy<'a, M, T> {
BusProxy(&self.0, marker::PhantomData)
}
}
pub struct BusProxy<'a, M: 'a + mutex::BusMutex<cell::RefCell<T>>, T>(
&'a M,
marker::PhantomData<T>,
);
impl<'a, M, I2C: i2c::Write> i2c::Write for BusProxy<'a, M, I2C>
where
M: 'a + mutex::BusMutex<cell::RefCell<I2C>>,
{
type Error = I2C::Error;
fn write(&mut self, addr: u8, bytes: &[u8]) -> Result<(), Self::Error> {
self.0.lock(|lock| {
let mut i = lock.borrow_mut();
i.write(addr, bytes)
})
}
}
impl<'a, M, I2C: i2c::Read> i2c::Read for BusProxy<'a, M, I2C>
where
M: 'a + mutex::BusMutex<cell::RefCell<I2C>>,
{
type Error = I2C::Error;
fn read(&mut self, address: u8, buffer: &mut [u8]) -> Result<(), Self::Error> {
self.0.lock(|lock| {
let mut i = lock.borrow_mut();
i.read(address, buffer)
})
}
}
impl<'a, M, I2C: i2c::WriteRead> i2c::WriteRead for BusProxy<'a, M, I2C>
where
M: 'a + mutex::BusMutex<cell::RefCell<I2C>>,
{
type Error = I2C::Error;
fn write_read(
&mut self,
address: u8,
bytes: &[u8],
buffer: &mut [u8],
) -> Result<(), Self::Error> {
self.0.lock(|lock| {
let mut i = lock.borrow_mut();
i.write_read(address, bytes, buffer)
})
}
}
impl<'a, M, SPI: spi::Transfer<u8>> spi::Transfer<u8> for BusProxy<'a, M, SPI>
where
M: 'a + mutex::BusMutex<cell::RefCell<SPI>>,
{
type Error = SPI::Error;
fn transfer<'w>(&mut self, words: &'w mut [u8]) -> Result<&'w [u8], Self::Error> {
self.0.lock(move |lock| {
let mut i = lock.borrow_mut();
i.transfer(words)
})
}
}
impl<'a, M, SPI: spi::Write<u8>> spi::Write<u8> for BusProxy<'a, M, SPI>
where
M: 'a + mutex::BusMutex<cell::RefCell<SPI>>,
{
type Error = SPI::Error;
fn write(&mut self, words: &[u8]) -> Result<(), Self::Error> {
self.0.lock(|lock| {
let mut i = lock.borrow_mut();
i.write(words)
})
}
}